Extracting hex head from bolt?- Mtbr.com
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  1. #1
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    Extracting hex head from bolt?

    So I broke off the tip of a ball-head hex wrench in a bolt.. Tried everything I could think of to get it out with no luck. Any suggestions? I would hate to cut the bolt and trash the stem.. Thanks

  2. #2
    S&G CREW
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    Try to use a small drill [smaller than ball end of course] and just drill deep enough so it will pull out.

  3. #3
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    Use a sharp punch to tap the piece the opposite direction that you were turning it when you broke it off. It should just fall out after that.

  4. #4
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    Thanks for the suggestions.. The Park tool steel seems to resist my drilling attempts.. I like suggestion #2 in theory but cant seem to quite execute! Argh

  5. #5
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    Make sure you've got a very sharp, very hard bit. I would not be surprised if the wrench was case-hardened in some way (hardened on the outside to prevent rounding over, but softer on the inside to keep it strong). If you are trying to drill into the hardened outer surface, it will be a bitch unless you have a very sharp, very hard drill. The hardware stores sell individual bits,some with surface treatments to harden them,for just a few bucks each. Try one of those in the right size instead of those old carbon steel bits you've had forever and never sharpened...the difference is remarkable and it might do the trick.
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  6. #6
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    You might be able to cut a groove in the broken tip or the head of the bolt with a dremel and a cutting disk. Then try a flat blade screwdriver, the biggest that will fit.

  7. #7
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    air hammer and the pointy chisel/tip.

  8. #8
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    If you have a welder you can position a nut over the head of the bolt, plug weld it in place and use a wrench to remove it? Shouldn't take much heat.

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